"But the problem with reincarnation is that it's hard to imagine what the storage medium for past lives would be. Not to mention the input-output device. I hesitate to rule it out completely, but I'd need pretty definite proof."
- Arthur C. Clarke

Making oxygen is the trick. Cracking water - hydrolysis - is comparatively easy; CO2 and oxidized dust take more energy and time. That's why we need fountains. Fountains are big, often the size of a semi cab... They plop down on the Red and if the dust is deep enough - if they're not on impenetrable hardpan - they burrow in and almost immediately pop out solar collectors and extraction vanes and whirl the vanes to collect moisture from the air.